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Benefit Plans (Narrative) (Details) (Pension Plan [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 4us-gaap_DefinedBenefitPlanContributionsByEmployer
Minimum [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Anticipated additional employer contributions 15us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Anticipated additional employer contributions $ 45us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember